Library Override links broken, how to fix?
Most external files can be quickly resolved by using File -&gt; External Data -&gt; Find Missing Files, there's options in that submenu for changing the path behavior per .blend.
Linked Libraries are slightly different, they can be re-linked using the Outliner, by switching the Display Mode to &quot;Blender File&quot; and then right-clicking the broken library to Relocate.
This may preserve the Library Override and it's data, but the feature is still being actively improved, so some datablocks may be reset to their linked state.